Why should the ladies have all the fun? No, sir, in this day and age the same gadget can provide pleasure for everyone. Yes, take your massager vibrator (e.g. the Dendou Big or Fairy Wand) and slip on this Cup Spacer attachment. The tempting hole is then buzzing and oscillating, either controlled by you or her.
Of course you slip yourself in just like that or, if you'd prefer (and what it's best for), put in a standard onacups and then give yourself some extra umph. Japan's known for innovation and even with vibrator attachments they are the masters of coming up with new ideas!
The Cup Spacer features: